A calibration method for broad-bandwidth cavity enhanced absorption spectroscopy performed with supercontinuum radiation

T. Laurila; I. S. Burns; J. Hult; J. H. Miller; C. F. Kaminski

doi:10.1007/s00340-010-4044-4

A calibration method for broad-bandwidth cavity enhanced absorption spectroscopy performed with supercontinuum radiation

T. Laurila, I. S. Burns, J. Hult, J. H. Miller, C. F. Kaminski

Chemical And Process Engineering

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Abstract

An efficient calibration method has been developed for broad-bandwidth cavity enhanced absorption spectroscopy. The calibration is performed using phase shift cavity ring-down spectroscopy, which is conveniently implemented through use of an acousto-optic tunable filter (AOTF). The AOTF permits a narrowband portion of the SC spectrum to be scanned over the full high-reflectivity bandwidth of the cavity mirrors. After calibration the AOTF is switched off and broad-bandwidth CEAS can be performed with the same light source without any loss of alignment to the set-up. We demonstrate the merits of the method by probing transitions of oxygen molecules O-2 and collisional pairs of oxygen molecules (O-2)(2) in the visible spectral range.

Original language	English
Pages (from-to)	271-278
Number of pages	8
Journal	Applied Physics B: Lasers and Optics
Volume	102
Issue number	2
Early online date	22 May 2010
DOIs	https://doi.org/10.1007/s00340-010-4044-4
Publication status	Published - Feb 2011

Keywords

ring-down spectroscopyOSCOPY
diode-lasers
light

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AU - Hult, J.

AU - Miller, J. H.

AU - Kaminski, C. F.

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AB - An efficient calibration method has been developed for broad-bandwidth cavity enhanced absorption spectroscopy. The calibration is performed using phase shift cavity ring-down spectroscopy, which is conveniently implemented through use of an acousto-optic tunable filter (AOTF). The AOTF permits a narrowband portion of the SC spectrum to be scanned over the full high-reflectivity bandwidth of the cavity mirrors. After calibration the AOTF is switched off and broad-bandwidth CEAS can be performed with the same light source without any loss of alignment to the set-up. We demonstrate the merits of the method by probing transitions of oxygen molecules O-2 and collisional pairs of oxygen molecules (O-2)(2) in the visible spectral range.

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A calibration method for broad-bandwidth cavity enhanced absorption spectroscopy performed with supercontinuum radiation

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